Morphology of Invertebrate Types

Cover Morphology of Invertebrate Types
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In the male, on the other hand, the terminal joint is modified as an organ of copulation. Its structure is very complicated and may be treated here only in a general way. The dorsal wall has more or less the shape of a trough which serv^es for the protection of the copulatory ap- paratus. The latter is the product of the ventral wall of the terminal joint. It consists of a sperm reservoir inclosed in a thin sac called hcematodocha, an e^nbolus or intromittent organ in the AGELENA N^VIA WALCKEN^...R 163 shape of a spiral tube, a conductor and various hard, chitinous additional structures. The swelling of the ha^matodocha causes the protrusion of the entire apparatus during copulation when the embolus is introduced into the sperm receptacle of the female.
The four pairs of thoracic appendages are seven-jointed legs.
Two of them are directed forward and two backward, so that the inner surface of the former corresponds to the outer surface of the latter, and vice versa. The first joint which serves for the attachment of the leg to the cephalothorax is called coxa or coxopodite, the second — trochanter or basopodite, the third — femur or meropodite, the fourth — patella or carpopodite, the fifth — tibia or propodite, the sixth — metatarsus or first dactylopodite, the seventh — tarsus or second dactylopodite.


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